Originally Posted by seedmunch
People who win money can take money off at any time.
Let me be the first to say, "YIKES!"
Anyway, I have no problem with the largest "chip" on the table being a specific bill size. I've never had any problem with hundreds playing in casinos, and I have no problem with hundreds or twenties (depending on the game I'm playing) playing in my game. For simplicity of counting stacks, viewing bets, etc. I limit cash to that specific bill type only.
As to an earlier thought about weighing the possible harm to a game by allowing a person to continually not have rebuy money because you've allowed him to buy chips from a player's stack... We're discussing edge-cases hopefully. In the overwhelming majority of buy-ins and re-buys, it should be cash, from pocket, to bank, for chips, into play.
If this is a recurring problem in your game, you most certainly need to address the root of it.